>> In all jurisdictions, the request for euthanasia or pas has to be voluntary, well-considered, informed, and persistent over time. The requesting person must provide explicit written consent and must be competent at the time the request is made. http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3070710/
This is fairly comprehensive, which is reassuring. However, the article goes on to say:
>> Despite those safeguards, more than 500 people in the Netherlands are euthanized involuntarily every year. In 2005, a total of 2410 deaths by euthanasia or pas [physician assisted suicide] were reported, representing 1.7% of all deaths in the Netherlands. More than 560 people (0.4% of all deaths) were administered lethal substances without having given explicit consent. For every 5 people euthanized, 1 is euthanized without having given explicit consent.
Just because regulations are strict, does not mean that they are strictly followed, or enforced.